Additive Effect of Vitamin K2 and Risedronate on Long Bone Mass in Hypophysectomized Young Rats
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概要
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Hypophysectomy (HX) arrests bone growth and induces osteopenia in the long bones of rats. The present study investigated the combined effect of vitamin K2 and risedronate on long bone mass in HX rats, in order to determine whether treatment with these two agents had an additive effect. Forty female Sprague-Dawley rats were hypophysectomized at 6 weeks of age by the supplier, and were shipped to our laboratory at three days after surgery along with ten intact rats that served as age-matched controls. The study was started on the day when the rats were received. Three HX rats were excluded from the study because of the failure of HX. Forty-seven rats (6 weeks old) were assigned to the following 5 groups by the stratified weight randomization method: intact controls, HX alone, HX + vitamin K2 (30 mg/kg, p.o., daily), HX + risedronate (2.5 μg/kg, s.c., 5 days a week), and HX + vitamin K2 + risedronate. The dosing period was 4 weeks. HX resulted in a decrease of the femoral bone area, bone mineral content (BMC) and bone mineral density (BMD), as well as a decrease in the cancellous bone mass of the proximal tibial metaphysis and the total tissue and cortical areas of the tibial diaphysis. These changes were associated with a marked reduction in the serum level of insulin like growth factor (IGF)-I and with elevation of serum alkaline phosphatase (ALP) and pyridinoline. Administration of vitamin K2 increased the serum ALP level in HX rats, but did not affect any of the other parameters. On the other hand, risedronate ameliorated the decrease of femoral BMD and cancellous bone mass at the proximal tibial metaphysis in HX rats without affecting the serum IGF-I level, as a result of not causing a significant elevation of serum pyridinoline. Vitamin K2 and risedronate combined had an additive effect on the femoral bone area, BMC and BMD, and the combined treatment group did not show any significant reduction of the total tissue and cortical areas at the tibial diaphysis, as well as a reduced serum pyridinoline level compared with untreated rats and an increased serum ALP level compared with untreated or risedronate-treated rats. These results suggest that risedronate had a positive effect on the BMD and cancellous bone mass of long bones in HX rats. Despite the lack of a significant effect of vitamin K2 on bone mass parameters, it had an additive effect with risedronate on the BMC, BMD and cortical bone mass of long bones in HX rats.
- 社団法人 日本実験動物学会の論文
著者
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SATO Yoshihiro
Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
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Sato Yoshihiro
Mitate Hospital Fukuoka Jpn
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Takeda Tsuyoshi
Department Of Geriatric Medicine Osaka University Graduate School Of Medicine
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YEH James
Metabolism Laboratory, Department of Medicine, Winthrop-University Hospital
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Iwamoto J
Institute For Integrated Sports Medicine Keio University School Of Medicine
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Yeh James
Metabolism Laboratory Department Of Medicine Winthrop-university Hospital
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Iwamoto Jun
Department Of Sports Medicine Keio University School Of Medicine
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Iwamoto Jun
Department Of Orthopaedic Surgery School Of Medicine Keio University
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Takeda Tsuyoshi
Institute For Integrated Sports Medicine Keio University School Of Medicine
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Takeda Tsuyoshi
Department Of Electrical And Electronic Engineering Faculty Of Mining Akita University
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Sato Yoshihiro
Department Of Materials Science And Engineering Faculty Of Engineering Osaka University
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Sato Yoshihiro
Department Of Biochemistry Kyoritsu College Of Pharmacy
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YEH James
Metabolism Laboratory, Department of Medicine, Winthrop University Hospital
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Sato Yoshihiro
Department of Applied Biological Science, Tokyo University of Science
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TAKEDA Tsuyoshi
Department of Sports Medicine, Keio University School of Medicine
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IWAMOTO Jun
Department of Sports Medicine, Keio University School of Medicine
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